containers/teuthology: Pin base image to focal

diff --git a/containers/teuthology-dev/Dockerfile b/containers/teuthology-dev/Dockerfile
index f1a4c600d1a5058b137ab25d799b6e2f2ec54d69..a486644d82b359d2fd6543bd1cf7c3127835c20f 100644 (file)
--- a/containers/teuthology-dev/Dockerfile
+++ b/containers/teuthology-dev/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:latest
+FROM ubuntu:focal
 ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get update && \
     apt-get install -y \